Improvement in propellers



`t man new aunt @Milne Letters Patent No. 97,952, da'telZDecember 14,18695 I'MPROVEMENT IN PROPELLERS.

Th Schedule referred to in these Letters Patent and making part of thesame.

lTo all whom it may concern Be it known that I, SIMON B. Mourir, of thecity and county of San Francisco, State of California, have l inventedan Improved Iropeller-heel and I do here by declare the followingdescription and accompanying drawings `are sutcient to enable any personskilled in y the art or science to which itmost nearly appertains,

to make and use my said invention or improvements without furtherinvention or experiment.

My invention relates to suoli improvements in propeller-wheels forvessels as will eiieetnally do away with the loss of` power consequenton the use of the ordinaryv paddlewheel, owing to the `pounding and llifting of the water, asthe buckets enter and emerge tion, in which- Arepresents the propeller-shaft. t

The wheelsB and B are firmly secured to the shai't, at the properdistanceapart, and `may be made of an desired pattern or form, having arim, D D.

Between the outer rims D 1),of the two wheels,- I placeaycoutinnous'spiral or serew-shaped piece of metal, E, which extendsentirelyaround thewheels B and llhis screw` is cut from met-al, so as toleave a rim or screw-blade, of the proper width to act as buckets orpaddles when the wheel is revolved in the water, and, when extendedaroundbetween the wheels, acire'ular opening will be left, passingentirely'around inside the screw.

The rims D D' of the wheels `B` and C should be united to this circularscrew at about its middle, so

that one `halt` of the screw will be inside `the rims, while the otherhalf is outside.

In driving this wheel through the water, it makes no di'iierence whetherthe entire diameterof the screw is submerged or not.

lVhen the entire diameter is beneath the surice of' the water, the waterwill follow the screw as it passes through it, thus giving aconstant andsteady pre sure at all times, while, after the screw has emerged1 itwill carry no water with it, as it would naturally iai from theslopingside of the screw as the wheel lturned. The same would be the effect asthe screw entered the water, thus doing away with the lifting andpounding which always accompany the use of the flat or'horizontalbuckets.

The spires of the screw` may be Vmade as liu' apart as desired, and in awheel intended for a fast-running wheel, it would be better to give thescrew long spres, as the resistance would be less, while the peculiarmotion of the screw will give a greater speed for the power employedthan any other form of buckets.

The buckets need not heeontinuens, but may be each made separate, andcurved, and attached in such a manner that if complet-ed or madecontinuous, a perfect spiral or screw would be formed, and whenconstructed in this manner, the wheel would give the same eeot as whenthe same was continuous.

The action of the screw in the water will be similar to that employed'nsoulliug a boat with an oar, as the .screw m'ovesfrom side to side oithe wheel, and causes a similar driving-force to result. v i

What I'claim, and desire to secure by Letters Iatent, is` y The floatsor buckets, formed by the convolutions of the circular spiral E,substantially as and for the purpose set forth. y l f In witnesswhereof', I have hereunto set my hand and seal. v Y

SIMON B. MOREY. [It s] iVitnesses: y

WM. GERLACH, Geo. H. S'raoNo.

